Reseating tool



July 6,1943. J. c. IRWIN RESEATING TOOL Filed June 20, 1941 n l s I ll/l vvvvvvvvm 1 gfi urnfom Justus C. Irwin Patented July 6, 1943 'i" QiFi EQE.

RESEATKNG TOOL Justus C. Irwin, Minneapolis, Minn, assignor to Ole 0. Bethe, Minneapolis, Minn.

Application June 2%, 1941, Serial No. 398.974

2 Claims. (Cl. 90-125) My invention relates to reseating tools and particularly to tools capable of reseating the seats of valves and similar devices.

An object of the invention resides in providing a reseating tool capable of use with gate valves and similar valves in which the tool can not be brought up to the seat from the exterior of the valve body in a longitudinal direction.

Another object of the invention resides in providing a tool for use in conjunction with a gate valve having oppositely facing valve seats and guide disposed between said valve seats.

An object of the invention resides in. providing a tool body having a cutting face with a pilot projecting outwardly therefrom and adapted to be inserted. into the valve transversely of the seats.

A still further object of the invention resides in providing the tool body with an annular recess for the purpose of clearing the guides.

Another further object of the invention resides in providing the reseating tool with means capable of being engaged by a revoluble driving member-having a shank adapted to xtend into the valve to rotate the tool.

An object of the invention resides in constructin Fig. 1.

Fig. 3 is a longitudinal, elevational, sectional view of a gate valve showing my reseating tool applied thereto.

Fig. 4 is a cross sectional view taken on line 44 of Fig. 3.

Fig. 5 is a longitudinal, sectional view taken on line 5-5 of Fig. 4.

For the purpose of illustrating my invention, I have shown the body E8 of an ordinary gate valve, which will now be described in detail. The body Ill is T-shaped in construction, having two branches II and I2 arranged in alignment with one another and a branch I3 extending laterally therefrom. These branches are constructed to form a valve chamber M which communicates with two passageways I5 and it extending through the branches II and G2. The two branches II and H! are threaded as indicated at IT to provide suitable connections to the pipe with which the valve is to be used, while the branch 83 is similarly threaded at it for the purpose of attaching the valve head and operating mechanism therefor to the valve body. These parts not forming any particular feature of the invention, have not been shown in the drawing.

The valve body ii] is constructed with two lateral walls 2! and 22, which form the chamber Id and which form part of the valve branches of the body. I

Within the chamber M are provided two annular valve seats 23' and 2t which encircle the passageways i5 and I 5. These valve seats face one another and are arranged in converging re lation so that when the gate is forced in between the same, the said passageways are closed from communicating with one another. The valve body iii is provided with two guides 25 and which are attached to the lateral walls 2! and 22 thereof and which serve to guide the gate into opening or closing position. These guides extend inwardly into the chamber Hi,

My invention proper comprises a tool body 3! circular in cross-section which is constructed of tool steel or other suitable material. The body 3! has a cutting face 32 at one end thereof which is provided with a plurality of cutting teeth arranged in proper formation so that when the tool is rotated, the said teeth engage the surface with which they contact and dress the same. An appreciable number of said teeth are preferably employed, so that a smooth and uniform out is procured without chattering and without producing irregularities on the valve seat surface. The body 3| is constructed with a bore 34 therein which receives the shank 35 of a pilot 36. The pilot 36 is of suitable dimensions to fit freely within the passageways l5 and IE at the portions thereof encircling the valve seats 23 and 24. Thus the said pilot serves to hold the face 32 of the tool in proper position for engagement with the particular valve seat with which the tool is being used. The pilot 36 is held in position within the bore 34 of body Si by means of a set screw 37! which is screwed into the said body and which has a point 38 received in a socket 39 in the shank 35 of said pilot.

In order to clear the guides 25, the body 3! is formed with an annular recess 4| which forms on the body a reduced portion 42 substantially cylindrical in form and a flange 33 projecting outwardly therefrom and on which the cutting face 32 is formed. In the application of the tool to the valve body IE3, the same is inserted in the open end of the branch 13 and slid along the chamber i4 into a position such as shown in Fig. 3. When so disposed, the two guides 25 are received in the recess A! of the tool body 3i and the tool is free to operate to dress the seat with which the face 32 of the tool is in engagement. The arrangement of parts when the tool is in operating position is shown in Fig. 5.

For operating the tool, the following construction is employed: Formed in the end of the shank 35 of pilot 36 is a screw driver slot 45. This slot is adapted tobe engaged by a screw-driver 46 having a shank 47 and a bit 48 at the end of the same.

The shank 35 of the pilot 35 is constructed of such length that the screw-driver slot 45 lies within the confines of the bore 34 of body 3!. This prevents the screw-driver bit 48 from slipping out of the slot endwise in the operation of the device.

The manner of using the tool is obvious. The tool is dropped into position in the chamber l4 through the open end of the branch l3 as previously described. The tool is then adjusted until the pilot 33, enters into the particular passageway l5 or IE, which it faces. In Fig. 3, the tool has been shown as properly positioned to dress the valve seat 23. The screw-driver 46 is then inserted through the passageway I6 and into the slot 45 of the pilot shank 35. Rotation of the screw-driver in the proper direction and application of pressure to the tool causes the seat to be dressed as desired. Upon completion of the dressing of one of the valve seats, the screw-driver is removed and the tool disengaged from the valve seat with which it was engaged and removed from the valve. Upon removal, the tool is reversed and applied as previously described and brought into engagement with the other seat. Thereafter the procedure may be repeated and the second seat dressed in the required manner. It will be noted from the drawing that the length of the body 3| and the pilot 36 is less than the dimensions between the two seats 23 and 24 at the center of the valve. Also the combined length of the flange 43 and the pilot 36 is less than the dimensions between the guides 25 and the respective valve seats 23 and 24 at the center of the valve. This permits of readily applying the tool to the Valve seats and of removing the same therefrom.

The advantages of my invention are manifest. The tool can be used for dressing valve seats of gate valves and similar devices where obstructions occur, makin it impossible to use tools having operating members attached thereto or having body portions of appreciable dimensions. The tool follows the inclination of the existing seat, so that the degree of the angle between the seats is not disturbed. My improved reseating tool is easily and quickly applied and functions in an effective manner to produce the desired results. By making the pilot removable, different sizes of pilots may be applied to the body of the tool and a single body thus used to dress numerous valve seats with different passageways therethrough. The screw-driver slot being confined within the bore of the body prevents disengagement of the bit therefrom.

Changes in the specific form of my invention, as herein disclosed, may be made within the scope of what is claimed without departing from the spirit of my invention.

Havin described my invention, what I claim as new and desire to protect by Letters Patent is:

1. A reseating tool comprising a body having a cutting face formed with cutting teeth, said body having a bore extending through the same, a pilot having a shank disposed within said bore, means for holding said pilot from rotation relative to said body, said shank having a screwdriver slot in the end thereof for rotating said body, said shank being of such length that the ends of said screw-driver slot are confined within the bore of said body.

2. In a reseating tool for use with a gate valve havin aligned passageways with facin valve seats encircling the same, and gate guides disposed between said seats, said tool comprising a body of a diameter greater than the diameter of the seat and having a cutting face formed with cutting teeth adapted to dress the valve seats, said body having an annular recess extending about the same into which the guides extend when the cutting face is in engagement with a valve seat, said body having a bore therein, a pilot having a shank disposed in said bore, the end of said shank being exposed through the end of said bore opposite the cutting face of the body, means for securing the body to the pilot and means on said end of the shank for engagement with a revoluble driving member for rotating the tool.

JUSTUS C. IRWIN. 

